Tonight: Partly cloudy, with a low around 51. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday: Sunny, with a high near 66. East wind 5 to 10 mph.
Saturday Night: Mostly clear, with a low around 49. East wind around 5 mph becoming south southeast after midnight.
Sunday: Mostly sunny, with a high near 70. South southeast wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday Night: Partly cloudy, with a low around 57.
Monday: Mostly sunny, with a high near 81.
Monday Night: Mostly clear, with a low around 62.
Tuesday: Sunny, with a high near 84.
Tuesday Night: Partly cloudy, with a low around 64.
Wednesday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 81.
Wednesday Night: A slight chance of showers. Mostly cloudy, with a low around 59.
Thursday: A slight chance of showers. Mostly sunny, with a high near 75.
Amf Ohare IL
41.98°N 87.9°W
Area Forecast Discussion below ad ...
AREA FORECAST DISCUSSION
National Weather Service Chicago/Romeoville, IL
GO Current Forecast Discussion
ARCHIVED
648 AM CDT Fri Sep 29 2017
.SHORT TERM... 332 AM CDT
Today through Sunday night...
Early morning radar imagery depicts a cold front moving southeast and approaching the Interstate 80 corridor. Breezy northerly winds will spread cooler air across the area this morning, with a few isolated showers diminishing across the eastern parts of the forecast area. Morning clouds associated with the frontal zone will move off to the east, with partly cloudy conditions expected for the remainder of the day as instability stratocu field develops this afternoon. An exception will be downwind of Lake Michigan into northwest Indiana, where the cool air spreading down the length of the lake will produce more cloud cover, and perhaps a few lake induced rain showers especially this afternoon and this evening. Winds, gusting around 20 mph especially near the lake, will shift northeasterly late today/tonight, which will likely spread lake effect cloud cover into far northeast IL, with a few sprinkles possible this evening. Highs this afternoon should range from the mid 60`s over far northeast IL, to the low-mid 70`s farther south of I-80.
Surface high pressure builds across the upper Midwest tonight, with the ridge axis extending from northeast WI into northwest IL by sunrise Saturday morning. Generally clear skies and light winds, combined with dry air will likely support widespread low temps in the lower 40`s across north central IL, and probably a few upper 30`s in the coolest of spots. Some lake clouds may linger across far northeast IL into early Saturday morning.
High pressure slowly drifts east across the region Saturday, with east winds maintaining cool temperatures in the 60`s across most of the area. Winds gradually shift more southeast into Sunday, as flow aloft become southwesterly and a warm up begins. Onshore winds north of Chicago will keep those areas coolest, in the mid- upper 60`s, while areas farther west and south moderate into the low-mid 70`s.
Ratzer
&&
.LONG TERM... 332 AM CDT
Monday through Thursday...
High amplitude upper pattern will be in place to start next week, with a deep long wave trough over western North America, and an upper ridge across the east. Deep south-southwest flow from the Plains to the Midwest will support another round of much above normal warmth across the forecast area into mid-week, with 850 mb temps progged to approach +15C Tuesday and Wednesday. 925 mb temps in excess of +20C would potentially support daytime highs in the mid-upper 80`s for both days, after around 80/low 80`s Monday. Record highs are 91/90 for Chicago for the 3rd and 4th, and 90 both days for Rockford.
Medium range guidance solutions begin to diverge by the middle of the week however, as the upper ridge retrogrades southwest across the lower Mississippi and Arklatex regions, and short wave energy flattening the upper flow across the Great Lakes region. Recent runs of the ECMWF bring the core of the upper ridge farther southwest, and bring a more amplified upper trough across the upper Midwest Wednesday into Thursday, with a surface cold front pushing southeast across the cwa. While the GFS and Canadian solutions hold up the front just north of the IL/WI border, the spread in model solutions does lower confidence for maintaining such warm temps by days 6-7. Presence of the frontal boundary also suggests an increased potential for clouds/precip during the Wednesday-Thursday time frame, though again confidence is fairly low given large spread in model solutions.
Ratzer
&&
.AVIATION... For the 12Z TAFs...
Main forecast concern for the period will be winds.
A cold front has pushed through the terminals early this morning. Winds are veering to nwly behind the front. Strong pressure rises across the area as low pressure lifts through the eastern Great Lakes and high pressure spreads across the upper Mississippi Valley, combined with modest cold advection, will lead to increasing gustiness through the morning hours. Wind direction should continue to veer from nwly to nely by early afternoon as the high continues to build east across the western Great Lakes. Winds will remain gusty closer to Lake Michigan into the early evening hours. As wind direction becomes more nely, some lake effect cloudiness is likely to develop tonight with flow becoming more directly off of the lake. A few sprinkles ot light showers are possible tonight, but coverage should be too sparse to mention in the TAFs at this time.
&&
.MARINE... 330 AM CDT
Winds are turning northwesterly as a cold front pushes south of the lake early this morning. Winds will continue to veer to northerly later this morning, with prevailing winds up to 25 kt and occasional gusts to 30 kt possible. The strong winds will set up dangerous conditions for small craft along the southern Lake Michgian nearshore waters through Saturday morning. There will also be a chance for lake effect showers with waterspouts through later this morning, especially over eastern sections of the lake, as cooler air overspreading the relatively warmer waters sets u Pstrong instability. High pressure should build across the lake on Saturday, which should result in lighter and more variable winds, followed by breezy southerly winds late Sunday into early next week as the high pushes to the east and a trough of low pressure moves across the northern and central plains.
&&
.LOT WATCHES/WARNINGS/ADVISORIES... IL...Beach Hazards Statement...ILZ006-ILZ014...1 PM Friday to 10 AM Saturday.
IN...Beach Hazards Statement...INZ001-INZ002 until 10 AM Saturday.
LM...Small Craft Advisory...LMZ740-LMZ741-LMZ742-LMZ743...1 PM Friday to 10 AM Saturday.
Small Craft Advisory...Gary to Michigan City IN until 10 AM Saturday.
MORE BELOW
+ + + + + +
Important links below ad ...
chicago.chgowx.com
NWS Forecast Chicago (O'Hare)
nexrad.chgowx.com
(NEXRAD Radar Chicago)
Arlingtoncardinal.com/radar
(Chicagoland Weather Radar)
Arlingtoncardinal.com/clouds
(Satellite Cloud Cover East United States)
Arlingtoncardinal.com/usforecastchart
(US Weather Forecast Chart)
Arlingtoncardinal.com/uvindex
Ultraviolet Index/UV Index
Arlingtoncardinal.com/sun
Chicagoland Sunrise, Sunset and Solar Information for Chicago area
Arlingtoncardinal.com/moon
Chicagoland Moonrise, Moonset and Lunar Phase information for Chicago area
Full climate/weather details chicagoweatherstation.com
(Desktop Mac/PC links)
Chicago record high temperatures
Chicago record low temperatures
Chicago extreme records
Chicago normal temperatures
Chicago Weather Radar
Chicago Weather Forecast
See also ...
Arlington Heights Weather Forecast
(Mobile/Desktop/Mac/PC)
allergy.chgowx.com
Chicago allergy weather
arthritis.chgowx.com
Chicago arthritis weather
respiratory.chgowx.com
Chicago respiratory weather
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Hazardous Weather Outlook National Weather Service Chicago/Romeoville IL 412 AM CDT Fri Sep 29 2017
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 300915- Winnebago-Boone-McHenry-Lake Illinois-Ogle-Lee-De Kalb-Kane- DuPage-Cook-La Salle-Kendall-Grundy-Will-Kankakee-Livingston- Iroquois-Ford-Lake Indiana-Porter-Newton-Jasper-Benton- 412 AM CDT Fri Sep 29 2017 /512 AM EDT Fri Sep 29 2017/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...Today and Tonight.
WEATHER HAZARDS EXPECTED:
High Swim Risk.
.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
Saturday... High Swim Risk. Wednesday... Limited Thunderstorm Risk.
.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be necessary through tonight.
LAKESHORE HAZARD MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
305 AM CDT FRI SEP 29 2017
ILZ006-014-291615-
/O.EXT.KLOT.BH.S.0022.170929T1800Z-170930T1500Z/
LAKE IL-COOK-
305 AM CDT FRI SEP 29 2017
...BEACH HAZARDS STATEMENT NOW IN EFFECT FROM 1 PM CDT THIS
AFTERNOON THROUGH SATURDAY MORNING...
* LOCATION...ILLINOIS LAKE MICHIGAN BEACHES.
* HIGH WAVE ACTION AND DANGEROUS SWIMMING CONDITIONS EXPECTED.
* FORECAST WAVE HEIGHTS...5 TO 8 FEET.
* STRONG RIP CURRENTS AND STRUCTURAL CURRENTS EXPECTED.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
LIFE THREATENING WAVES AND CURRENTS ARE EXPECTED AT THE BEACHES.
PEOPLE VISITING THE BEACHES SHOULD STAY OUT OF THE WATER.
RIP CURRENTS ARE POWERFUL CHANNELS OF WATER FLOWING QUICKLY AWAY
FROM SHORE, WHICH OCCUR MOST OFTEN AT LOW SPOTS OR BREAKS IN
SANDBARS. RIP CURRENTS CAN SWEEP YOU INTO DEEPER WATER.
STRUCTURAL CURRENTS FORM ALONG PIERS WHERE LONGSHORE CURRENTS AND
WAVE ACTION FLOW INTO THE STRUCTURE. STRUCTURAL CURRENTS CAN
SWEEP YOU INTO DEEPER WATER ALONG THE PIER STRUCTURE.
EXPOSED BEACHES ARE MORE LIKELY TO EXPERIENCE THE MOST
SIGNIFICANT WAVE AND CURRENT IMPACTS. IMPACTS AT BEACHES WITH
PROTECTIVE BREAKWALLS OR JETTIES WILL BE SUBJECT TO THE
ORIENTATION OF STRUCTURES AS WELL AS WIND AND WAVE DIRECTION.
FOR INFORMATION ON SWIM ADVISORIES OR BANS AT CHICAGO BEACHES
VISIT: WWW.CPDBEACHES.COM.